/*
 * Copyright 2011 The IEC61850bean Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.beanit.josistack;

import com.beanit.jositransport.ClientTSap;

import javax.net.SocketFactory;
import java.io.IOException;
import java.net.InetAddress;
import java.nio.ByteBuffer;

/**
 * This class implements the Service Access Point (SAP) for the Application Control Service Element
 * (ACSE) protocol as defined by ISO 8650 or ITU X.217/X.227. The ACSE provides services for
 * establishing and releasing application-associations. The class also realizes the lower ISO
 * Presentation Layer as defined by ISO 8823/ITU X226 and the ISO Session Layer as defined by
 * 8327/ITU X.225.
 */
public final class ClientAcseSap {
    static final byte[] P_SEL_DEFAULT = {0, 0, 0, 1};
    static final byte[] S_SEL_DEFAULT = {0, 1};
    public ClientTSap tSap = null;
    public byte[] pSelRemote = P_SEL_DEFAULT;
    public byte[] pSelLocal = P_SEL_DEFAULT;
    public byte[] sSelRemote = S_SEL_DEFAULT;
    public byte[] sSelLocal = S_SEL_DEFAULT;

    private int[] apTitleCalled = new int[]{1, 1, 999, 1, 1};
    private int[] apTitleCalling = new int[]{1, 1, 999, 1};
    private int aeQualifierCalled = 12;
    private int aeQualifierCalling = 12;

    /**
     * Use this constructor to create a client ACSE Service Access Point (SAP) that will start
     * connections to remote ACSE SAPs. Once constructed the AcseSAP contains a public TSAP that can
     * be accessed to set its configuration.
     */
    public ClientAcseSap() {
        tSap = new ClientTSap();
    }

    public ClientAcseSap(SocketFactory socketFactory) {
        tSap = new ClientTSap(socketFactory);
    }

    public void setApTitleCalled(int[] title) {
        this.apTitleCalled = title;
    }

    public void setApTitleCalling(int[] title) {
        this.apTitleCalling = title;
    }

    public void setAeQualifierCalled(int qualifier) {
        this.aeQualifierCalled = qualifier;
    }

    public void setAeQualifierCalling(int qualifier) {
        this.aeQualifierCalling = qualifier;
    }

    /**
     * Associate to a remote ServerAcseSAP that is listening at the destination address.
     *
     * @param address                 remote InetAddress
     * @param port                    remote port
     * @param localAddr               local InetAddress
     * @param localPort               local port
     * @param authenticationParameter an authentication parameter
     * @param apdu                    the payload to send with the association request
     * @return the association object
     * @throws IOException if an error occurs connecting
     */
    public AcseAssociation associate(InetAddress address, int port, InetAddress localAddr, int localPort,
                                     String authenticationParameter, ByteBuffer apdu) throws IOException {
        AcseAssociation acseAssociation = new AcseAssociation(null, pSelLocal);
        try {
            acseAssociation.startAssociation(
                    apdu,
                    address,
                    port,
                    localAddr,
                    localPort,
                    authenticationParameter,
                    sSelRemote,
                    sSelLocal,
                    pSelRemote,
                    tSap,
                    apTitleCalled,
                    apTitleCalling,
                    aeQualifierCalled,
                    aeQualifierCalling
            );
        } catch (IOException e) {
            acseAssociation.disconnect();
            throw e;
        }
        return acseAssociation;
    }
}
